body {
  background-color: #000;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  #app {
    background-color: #000;
    border: solid 10px #333;
    position: relative;
    overflow: hidden;
    box-sizing: content-box;
    canvas {
      position: absolute;
    }
  }
}
